Lorentz PS2-150 Series Manual For Installation And Operation page 53

8.5.5.4 Replacement of the Mechanical Seal
The sealing between the motor and the pump housing
is done by means of a mechanical seal. It is normal for a
few drops of water to seep in once in a while, especially
during the break-in period. Depending on the nature of the
water and the duration of operation, the mechanical seal
may become leaky after some time. If the water penetrates
con-tinuously, replace the complete mechanical seal with a
new one. The seals must be replaced by a competent person.
Dismantling – Switch off the pump and disconnect it from
the power supply. The mechanical seal always has to be
replaced completely. To do so it is not necessary to dismount
the complete pump – only the motor unit has to be removed
from the housing by loosening the hexagonal socket screws.
Remove the fan cover of the motor by loosening the three
screws. Put a screwdriver into the slot of the motor shaft
(fan side), hold it and remove the impeller cap screw and
the O-ring.
CAUTION – The impeller cap screw (with
plastic head) has a left-handed thread.
That means the screw must be turned
clockwise (top view) to remove it.
The impeller is screwed onto the motor shaft (right-handed
thread). Hold the motor shaft with the screw driver (fan
side) and unscrew the impeller.
CAUTION – The impeller is secured by
LOCTITE 480 (similar to Cyanoacrylate
immediate glue).
Carefully lever the mechanical seal out of their fixations with
a screwdriver.
Pump Installation
Assembly – Apply some petroleum jelly at the edges of the
mechanical seal before pressing it in.
Follow these instructions in reverse for reassembly.
CAUTION – Before reassembly clean the
surfaces of the components with alcohol
or with a clean paper tissue.
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